Marathon service fails to run

Hello, I've Qradar CE installed for development purposes. Now every extension and app I've created is not running - after clicking tab there is just blank page. I figured out, that marathon service does not run:

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Thanks, that solved the issue with marathon service. I had to reboot virtual machine and now I can see installed extensions like App Editor.

Only one problem occured with my app, it is in devel stage loaded with qradar_app_creator. I get NGINX 404 error in tab. I can not uninstall it and do anything with it. From REST API a get this message:

In docker ps - there is no app with id 1001. I am familiar with docker, but not with mesos. Is there any way how to start the app from shell or delete it from shell? Do you have any hints about this, what should I do?